RunRyder RC Helicopter Topic - Spectra G gets a Wally 27 cc motor, fan and shroud

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Gasser Model RC Helicopters > Spectra G gets a Wally 27 cc motor, fan and shroud

rbort
Elite Veteran
Location: Franklin, MA - U.S.A.

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Coil?

Looks to me like the coil is red on the bottom. What are you guys talking about anyways? The grey one is the secondary coil to the spark plug, all that looks right.

In one of the photos looks like there is some wear on the engine exhaust port and marks where it mounts from the side. Was this a rebuilt engine converted to a 27 or a new motor, just curious...

The uniball thing should be tight and on, should not fall off or wear out. You can re-expoxy it back with JB weld to fill the gap or if its too worn get a new one and put it on with JB weld.

The coupler in the tail should be filled with grease before you insert the dogbone, that will minimize the wear.

10500 seems really slow, I never run mine that slow. What that head speed you may experience wobble on the tempest head (as I saw with my Spectra-g). On the 1005 if you have the 3D head it might be OK. In general I run mine as slow as 1550 rpms head speed to stay out of the wobble. That translates to 10,800 at a minimum on the 1005 to 11,000 on the Spectra.

Fly it some more and lets see how the engine will settle down for you.

-=>Raja.

1005 Gasser, G26 3DMax++, 2205+ flights
Spectra-g, G26 3DMax, 870+ flights

10-29-2009 05:06 PM

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CNCjunkie
Senior Heliman
Location: Kauai (The Garden Isle), Hawaii - USA

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Raja, I think they're talking about the plug boot.

Wally ran a gallon through mine and what you see is probably just the stain from the exh gasket. The 27 is all new parts.

lejon, Raja is right about the wobble. If you go much lower than 1500 head speed with the Tempest head, she's going to shake her skids at you. When I was setting my throttle curves, I thought WTF, but as soon as I brought the RPM to 1550 the wobble went away.

So Raja, it's only the Tempest head that does this?.

Just another crappy day in Paradise....Aloha!

10-29-2009 05:31 PM

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jrockstuart
Elite Veteran
Location: Allen, Texas

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Quote
I didn't want to wait for a replacement order so I cannibalized from myother G.

Uh oh. Better not be too impatient.

MinAir Spectra-G
Trex 450Pro V-bar /Scorpion /JR
Wally Motors/New England Heli/DL Canopies

10-29-2009 05:33 PM

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rbort
Elite Veteran
Location: Franklin, MA - U.S.A.

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Well...?

Quote
Shouldn't that be a red coil on the engine?

I'm confused because of this. Wouldn't Excaliber say "boot" instead of "coil" in his statement?

I only saw the wobble with the tempest head on my Spectra. On my 1005 I ran the head as slow as 1500 in the past and didn't see that there. I ended up picking up the rpms some as I felt it was too slow and the disk didn't look as solid.

-=>Raja.

1005 Gasser, G26 3DMax++, 2205+ flights
Spectra-g, G26 3DMax, 870+ flights

10-29-2009 05:35 PM

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CNCjunkie
Senior Heliman
Location: Kauai (The Garden Isle), Hawaii - USA

My Posts This: Topic Forum

I agree and thought the same thing at first, but then maybe he meant to type red coil boot.

Excal???

Anyway, I have red primary and gray secondary with a black boot.

Just another crappy day in Paradise....Aloha!

10-29-2009 05:43 PM

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lejon
Senior Heliman
Location: Las Vegas, Nevada

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Wobble and the grey coil

I thought there were two coils on the gasser engines and since the one connected to the spark plug wire is grey. I thought they were red but had not really paid attention to it.

When I set the rpm to 10500 before taking the old engine out it seemed to be ok. I think there were too many other issues that could have asked the wobble. I will take particular notice tomorrow when I fire it up.

What is the easiest way to get video for all to watch? Here? Vimeo, Youtube? and if you don't mind How?

Raja the engine was new and Wally bench ran (with a prop) a gallon through it. The stuff on the surface was residual from the duct tape used to protect the piston area from garbage.

JROCK I changed out the clutch with a known good one from my other machine and if there is no run out on the start shaft I will order the replacement ball.
Lejon

10-29-2009 07:30 PM

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Excalibur
Veteran
Location: Destination: Earth

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Quote
I'm confused because of this. Wouldn't Excaliber say "boot" instead of "coil" in his statement?

Yup, I think Raja is right. I didn't check the pic against my engine. That's what I get for being in a hurry.

Xcal

Camper Fuel: It's Not Just for Breakfast Anymore

10-30-2009 07:11 PM

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lejon
Senior Heliman
Location: Las Vegas, Nevada

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It was ready to hover then I noticed that the throttle servo was acting up. I would bring the rpms up so that the GV1 would kick in and the throttle servo would start to twitch. The best way to describe it is that it were as if I couldn't hold the throttle and kept jerking it up and then back down.

When it is idling it reminds me of a contented cat purring away.

I noticed that the Hitec servo lasted a good while but since I didn't have another one I used a 4131. When on my 1005 those seemed to last for ever. Well less than a gallon after installing this one it too seems to be on its' way out.

I will try and get video taken and uploaded over the weekend.

Lejon

10-31-2009 05:41 AM

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lejon
Senior Heliman
Location: Las Vegas, Nevada

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Minor setback

I changed out the Hitec servo for a JR 4131 (used) and the problem did not go away. I then took out the GV1 to see it that had any effect and noticed that it was actually making the situation better as whenever the servo would change the throttle the GV1 would try and correct it.

I then went out and bought a NIB Hitec 311 servo for the throttle and again for a minute or so it seemed to work. I took everything apart and rerouted wires (checking for chaffing but there was none) then checked the carb and engine for leaks and there were none. I then checked the servo and since it all seemed to be in working order I fired it up and low and behold at idle it would not stay steady. I watched the throttle servo and it looked as if a 5 year was playing with the stick, it was all over the place. It was only the throttle servo none of the others had any movement. When shut down everything went back to normal. While idling even throttle hold did not keep is constant.

At this point I can only think of three things that could be causing this.

1. Need to rebind the Tx and Rx.
2. Rx has gone south.
3. The original Hitec the used 4131 and the new Hitec 311 won't work for the throttle.

I am thinking that if it is binding then other channels would have an issue. If it is the Rx gone south I will swap it out with a NIB in the morning and check that out. Or if it is number 3 then why did the first two work for a good while? The BB hitec lasted for 6 months or so and the 4131 was in the 1005 for a few years then I sent them in to JR and they were either fixed or replaced with as a minimum the leads were replaced.

Any ideas?

lejon

11-02-2009 05:05 AM

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AceBird
Elite Veteran
Location: Utica, NY USA

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Is there any misfire ... as in intermittent spark plug, grounded HT wire, or bad coil?

Ace
What could be more fun?

11-02-2009 01:22 PM

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lejon
Senior Heliman
Location: Las Vegas, Nevada

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Ace I swapped out the coil because it did not seem to be making good contact with the spark plug tip, I also changed plugs CMR 7H. I can see the servo moving so I do not think it is the coil.

I did the rebind this AM and it did not seem to help.

Lejon

11-02-2009 02:50 PM

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rbort
Elite Veteran
Location: Franklin, MA - U.S.A.

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Thoughts

Are you using a stator gator or the stock sensor?

-=>Raja.

1005 Gasser, G26 3DMax++, 2205+ flights
Spectra-g, G26 3DMax, 870+ flights

11-02-2009 03:20 PM

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lejon
Senior Heliman
Location: Las Vegas, Nevada

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Stator gator?

Lejon

11-02-2009 03:21 PM

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rbort
Elite Veteran
Location: Franklin, MA - U.S.A.

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Try to take out the stator gator and put the sensor from the gv-1 on the motor crankcase. I saw this issue before and I don't for the life of me have an explanation for it. I tried everything to fix it back at the MHA funfly in 2006 and the only solution was to remove the stator gator.

But yet again, the stator gator works very well for many people, and I use it in my 1005 with no issues at all. It was just an issue with my particular machine, and could be the cause on yours.

-=>Raja.

1005 Gasser, G26 3DMax++, 2205+ flights
Spectra-g, G26 3DMax, 870+ flights

11-02-2009 03:38 PM

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lejon
Senior Heliman
Location: Las Vegas, Nevada

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Ok I think as a quick check I am going to take the GV1 out and make sure that everything is working then I'll re-install it with the standard sensor instead of the GV1.

Thanks

Lejon

11-02-2009 03:47 PM

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AceBird
Elite Veteran
Location: Utica, NY USA

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I thought you did do that. Isn't that what you meant when you said this?

Quote
I then took out the GV1 to see it that had any effect and noticed that it was actually making the situation better as whenever the servo would change the throttle the GV1 would try and correct it.

Ace
What could be more fun?

11-02-2009 10:21 PM

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lejon
Senior Heliman
Location: Las Vegas, Nevada

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Yes Ace I unplugged the throttle to the GV1 and plugged it into the eX. The Stator Gator was left installed and was still connected to the ground wire on the engine.. My second input meant that I was going to completely remove it from the heli and try again. Also it maybe that the GV-1 was smoothing out the changes but at the same time the Stator Gator may have been causing them.

Having to work late again so I am not sure if I will get to it tonight.

Lejon

11-03-2009 12:56 AM

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Gasser Model RC Helicopters > Spectra G gets a Wally 27 cc motor, fan and shroud

lejon
Senior Heliman
Location: Las Vegas, Nevada

My Posts This: Topic Forum

Project on hold

It appears that the issue with the uniball from the old engine and fan was that the fan was touching the clutch (0 instead of 20/1000 clearance). This caused a considerable amount of damage to the fan surface and the bearings in the clutch assembly.

Although I changed out the clutch assembly, there are still some issues that may be from bearings gone bad, links loosening up and things like that.

I don't want to wreck a new engine and a good heli for reasons I could have addressed, so I'm going to go over every inch of the heli and replace anything that is questionable. Once that is done I will post the restart of the project. My guess is 2 weeks so around the 20th of November.

Thanks

Lejon

11-04-2009 02:25 PM

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Gasser Model RC Helicopters > Spectra G gets a Wally 27 cc motor, fan and shroud

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